/*
 * This file is a part of Alchemy OS project.
 *  Copyright (C) 2011-2013, Sergey Basalaev <sbasalaev@gmail.com>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package alchemy.core;

/**
 * A library is a function factory.
 *
 * @author Sergey Basalaev
 */
public abstract class Library {

	/**
	 * Constructor for subclasses.
	 */
	protected Library() { }

	/**
	 * Returns function for given signature.
	 * @param sig function signature
	 * @return
	 *   <code>Function</code> instance or <code>null</code>
	 *   if library does not contain function with given signature
	 */
	public abstract Function getFunction(String sig);
}
